How to convert a VMDK to a RDM
Sometimes you have a nice colleague who is moving a Virtual Machine from one datacenter to another, however if this Virtual Machine have a RDM connected to it, and the storage is not linked to each other you would end up with an extra VMDK, that once was a RDM 
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Okay so far my frustration 
(just kidding here) but It would be nice if VMware would have shown a big information message, that indicate that the RDM will be converted to a VMDK when an Admin is doing something like mentioned here above, because not every administrator is aware what he is doing.
S
Now lets take a look at how we can fix this, because we end up with quite a large VMDK file of around 450 GB, and because we only have a few VMFS datastores of approximately 500 GB each, this is not a great situation.